Setting Audio Levels
Your program audio source is typically embedded in the standard video input to your encoder. Audio may also
originate from a separate Analog or AES source (XLR connector input to encoder). To send this program audio to
captioners through iCap, you must first configure the audio settings through the front panel menu of the encoder.
From the main menu go to Audio Setup > Audio Mix and set to Stereo or Surround appropriately. Next, visit
Audio Setup > Peak Level and ensure the audio level peaks at around 80% and does not warn “Clipping!” This
step is crucial for ensuring that quality audio is being sent to the captioner (quality audio = quality captions).
If your audio levels are too low, or too high – you can achieve an appropriate level by adjusting the audio source
itself or simply adjusting the source audio level from the encoder front panel LCD menu Audio Setup > Scale
Audio which allows you to scale the audio up or down in 6 decibel increments.
Detailed Explanation of Audio Setup Menu Options
Input Select
Selects whether the input audio format is analog, AES digital or embedded audio.
Use the LEFT and RIGHT keys to select the correct format, then press ENTER to exit
and apply changes or CANCEL to exit and cancel changes. The AV650 does not
currently support direct input of Dolby® E or other compressed audio signals.
Peak Level
Dynamically displays the peak signal level at the audio input. A warning message
will be displayed when clipping is detected at the input. For optimal sound quality,
the peak level bar should reach at least 60% across the screen, but should never
display “Clipping!”
Scale Audio
Adjusts the audio input level without adjusting the output level of your source. The
built-in digital input trim can boost or cut the audio input level up by as much as 12
dB.
Audio Group
Selects the SDI embedded audio channel group that the iCap
™
mix is sourced from.
Up to 4 channel groups can be carried on an SDI signal, though most commonly
Group 1 carries the primary audio program. Applies only when embedded audio
input is selected.
Audio Mix
Selects whether the iCap
™
mix is being created from a Stereo or Surround channel
group. Choose “Stereo” to select a mix of the left and right channels (1 & 2 or 3 & 4
within the selected Audio Group, according to the Stereo Channel setting), or
“Surround” to select a mix of the left, right, and center channels (1, 2 & 3 within the
selected Audio Group). Applies only when embedded audio input is selected.
Stereo Channel
Selects whether the iCap
™
stereo mix is being created from channels 1 & 2 or
channels 3 & 4 within the selected Audio Group. Applies only when embedded
audio input AND stereo audio mix are selected.
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